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linux/arch/powerpc/kexec
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Hari Bathini bd7dc90e52 powerpc/64/kdump: Limit kdump base to 512MB 
Since commit e641eb03ab ("powerpc: Fix up the kdump base cap to
128M") memory for kdump kernel has been reserved at an offset of 128MB.
This held up well for a long time before running into boot failure on
LPARs having a lot of cores. Commit 7c5ed82b80 ("powerpc: Set
crashkernel offset to mid of RMA region") fixed this boot failure by
moving the offset to mid of RMA region. This change meant the offset is
either 256MB or 512MB on LPARs as ppc64_rma_size was 512MB or 1024MB
owing to commit 103a8542cb ("powerpc/book3s64/ radix: Fix boot
failure with large amount of guest memory").

But ppc64_rma_size can be larger as well with newer f/w. So, limit
crashkernel reservation offset to 512MB to avoid running into boot
failures during kdump kernel boot, due to RTAS or other allocation
restrictions.

Also, while here, use SZ_128M instead of opening coding it.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220912065031.57416-1-hbathini@linux.ibm.com
History 2022-09-28 19:22:09 +10:00
..
core.c powerpc/64/kdump: Limit kdump base to 512MB 2022-09-28 19:22:09 +10:00
core_32.c powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
core_64.c powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
crash.c powerpc/crash: save cpu register data in crash_smp_send_stop() 2022-07-28 16:22:13 +10:00
elf_64.c powerpc: If kexec_build_elf_info() fails return immediately from elf64_load() 2021-04-26 16:28:26 -05:00
file_load.c powerpc: Delete unused function delete_fdt_mem_rsv() 2021-03-08 12:06:30 -07:00
file_load_64.c powerpc/kexec: Fix build failure from uninitialised variable 2022-08-10 15:55:20 +10:00
Makefile powerpc/kasan: Disable address sanitization in kexec paths 2022-05-22 15:58:29 +10:00
ranges.c powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU 2021-12-09 22:41:13 +11:00
relocate_32.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00